package servlet;

import Util.Page;
import pojo.User;
import service.UserService;
import service.impl.UserServiceimpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;

@WebServlet(urlPatterns = {"/user"})
public class UserServlet extends HttpServlet {
    //创建业务层对象 多态
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceimpl();
        req.setCharacterEncoding("utf-8");
        resp.setCharacterEncoding("utf-8");
        String action = req.getParameter("action");
       if ("user".equals(action)) {
           String name = req.getParameter("name");
           String pass = req.getParameter("pass");
           String currentPage = req.getParameter("currentPage");
           if (currentPage == null) {
               currentPage = "1";
           }

           int int_currentPage = Integer.parseInt(currentPage);
           Page page = new Page();
           User condition = new User(name, pass);

           //查询总记录数
           int totalCount = userService.count(condition);
           //绑定page相关参数
           page.setTotalCount(totalCount);//打断点
           page.setCurrentPage(int_currentPage);
           page.setTotalPage();
           //计算偏移量
           int offset = (int_currentPage - 1) * page.getPageSize();

           List<User> users = userService.findAll(condition, offset, page.getPageSize());
           req.setAttribute("users", users);//此处打断点用Debug启动
           req.setAttribute("condition", condition);
           req.setAttribute("page", page);
           req.getRequestDispatcher("/user.jsp").forward(req, resp);
       } else if ("delete".equals(action)) {
            String sid = req.getParameter("id");
            int id=Integer.parseInt(sid);
            //根据id查询用户信息
            int result=userService.deleteUserById(id);
            if(result>0){
                //重定向,再次查询
                resp.sendRedirect("user?action=user");
            }
        } else if ("update".equals(action)) {
            String sid=req.getParameter("id");
            int id=Integer.parseInt(sid);
            //int id=Integer.parseInt(req.getParameter("id"));
            //拿到页面传递的参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result=userService.updateUser(new User(id,name,pass));
            //重定向,再次查询
            if(result>0) {
                resp.sendRedirect("user?action=user");
            }
        } else if ("add".equals(action)) {
            //拿到页面传递的参数
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.addUser(new User(name, pass));
            //重定向,再次查询
            if(result>0) {
                resp.sendRedirect("user?action=user");
            }
        } else if ("toupdate".equals(action)) {
            //拿到页面传递的参数
            String sid = req.getParameter("id");

            int id=Integer.parseInt(sid);

            //根据id查询用户信息
            User user=userService.findUserById(id);
            //将查询到的用户信息存储到作用域中
            req.setAttribute("user",user);
            req.getRequestDispatcher("update.jsp").forward(req,resp);
        }
    }
}
